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c66e0f453d
Instead of using struct timespec64 in scm_timestamping_internal, use ktime_t, saving 24 bytes in kernel stack. This makes tcp_update_recv_tstamps() small enough to be inlined. The ktime_t -> timespec64 conversions happen after socket lock has been released in tcp_recvmsg(), and only if the application requested them. $ scripts/bloat-o-meter -t vmlinux.0 vmlinux add/remove: 0/2 grow/shrink: 5/4 up/down: 146/-277 (-131) Function old new delta tcp_zerocopy_receive 2383 2425 +42 mptcp_recvmsg 1565 1607 +42 tcp_recvmsg_locked 3797 3823 +26 put_cmsg_scm_timestamping64 131 149 +18 put_cmsg_scm_timestamping 131 149 +18 __pfx_tcp_update_recv_tstamps 16 - -16 do_tcp_getsockopt 4024 4006 -18 tcp_recv_timestamp 474 430 -44 tcp_zc_handle_leftover 417 371 -46 __sock_recv_timestamp 1087 1031 -56 tcp_update_recv_tstamps 97 - -97 Total: Before=25223788, After=25223657, chg -0.00% Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Jason Xing <kerneljasonxing@gmail.com> Link: https://patch.msgid.link/20260304012747.881644-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>